Table 8: DC Power Input Specifications
Parameter Value
Main Input Voltage Range +4.5 VDC to +5.5 VDC
Main Input Voltage Nominal 5.0VDC
Main Input Voltage – Ripple 40 mV pp
Consumption at +5.0 VDC Value
Input Standby Current (average) 100mA
Peak Transient Current – Transmit <= 2.0A
Current Average – when SBD message transfer in process <= 350 mA
Average Power consumption – when SBD message transfer in process
<= 1.75 W
Note: The average power consumption depends on the view of the satellite constellation from the
antenna.
The external power supply needs to
guarantee
the following:
•
The supply voltage droop over an 8.3mS burst should not be more than 0.2 Volts.
•
The power supply should limit the in-rush current to 4 Amps maximum
•
The supply noise should be less than that in the following profile (linear interpolation between these
points):
•
100 mV pk-pk 0Hz to 50 kHz
•
5 mV pk-pk in 50 kHz bandwidth at 1 MHz
•
10 mV pk-pk in 1 MHz bandwidth at 1 MHz
•
5 mV pk-pk in 1 MHz bandwidth above 5 MHz.
5.2.1 Power On/Off Control
An external on/off input is provided on a pin of the multi-interface connector. The 9601 starts up when
power is applied and the power on/off input is high. As long as the input voltage is applied, logic high on
this line turns the transceiver on and a logic low turns it off. If this line is not required then it must be
connected directly to the +5 V supply. The input logic high threshold is 2.0 V and the logic low threshold is
0.5 V.
Note that this on/off control is
not
the same as the 9522A SBD Modem.
5.3 Serial Data Interface
The Serial data interface is used to both command the 9601 and transfer user data to and from the
Transceiver. The 9601 presents a 9-wire data port to the FA (Field Application), where the interface is at
RS232 levels. With respect to this interface, the 9601 SBD Transceiver behaves as a DCE (Data
Communication Equipment), and the FA behaves as a DTE (Data Terminal Equipment).
The terms “FA” and “DTE” are used interchangeably throughout this document; similarly for the terms
“9601 SBD Transceiver” and “DCE”.
Autobaud is not supported in 9601 SBD Transceiver. The baud rate can be set via the AT+IPR command.
The default rate is 19200 bps.
5.3.1 9-Wire and 3-Wire Operation
By default, the serial interface operates as a 9-wire connection. Table 9 describes each of the signals,
where “input” means an input to the 9601 SBD Transceiver, and “output” means an output from the 9601
SBD Transceiver.
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